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A magnetic domain is a region in which the magnetic fields of atoms are grouped together and are aligned with each other. A paper clip can be turned into a magnet by rubbing a strong magnet several times over the surface of it. More you rub the magnet over the paper clip, the stronger the paper clip will become magnetized.It happens due to rubbing , some of the magnetic domains in paper clip get aligned and the metal becomes partially magnetized. When we rub the magnet over the metal a second time, more of the magnetic domains become aligned and the metal becomes a stronger magnet.
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